A、The man’s professor. B、The man’s roommate. C、A neighbor. D、The man’s brother. B由文中的相关词“move in，apartment，a room change”可推断出他们是

I’m having problems living with Colin. We’ve barely spoken to each other in a month, and when we do, it’s to fight. It started when we first moved in. I had a lot of things, and Colin wasn’t thrilled. He’s not easy to please, you know. I put all my stuff in the closet in the kitchen. This made him really upset because he wanted to put his surfing gear in there. What’s more, I like a neat, orderly apartment, but Colin is so carefree. His part of the apartment is always a mess. That’s ok if he’s just messy in his room, but we also share living space, such as the kitchen, sitting room, bath etc. I have tried talking to him about this, but then he starts yelling at me about how my friends are always coming over when he has a lot of work to do. I don’t know what to do. The head resident promised to talk to Colin. I will see how it goes. If I still have a problem at the end of week, I will ask for a room to change.